Improvement in machines for grinding saw-blades



niiet I %tttea aan eine.

CHARLES J. GARDNER, OE PHILADELPHIA, PENNSYLVANIA.

l Letters Patent No. 108,775, dated November 1,1870.

IIVIPROVENIENI"v IN MACHINES FDR GRINDING SW-BLADES.

The Schedule referred to in these Letters Patent and'aaking part of thesame.

To all who-m it may concern:

Be it known that I, CHARLES J. GARDNER, ot'

Philadelphia, in the county' of Philadelphia and State of Pennsylvania,have invented a new and improved Machine for Grinding Saw-Blades; and Ido hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawingforming part.

of this specification, in'which Figure 1 represents a side elevation,partly in scction, of my improved saw-grinding machine.

Figure 2 is a plan or tcp view o'- the same.A

Similar letters of reference indicate corresponding tary grinding-stonesin swiveled shafts, which allow the setting of the grinding-faces at anydesired angle to each other.

The invention consists, also, in the combination therewith ofreciprocating holders for the saw-blades, and in the use oi' anadjustable shoe, by which the taper of the blade toward the back.isregulated.

A in the drawing represents the frame of my improved saw-bladegrinding-machine.V This frame is made of wood, or other material ot'suitable size and form to contain the machinery connected with thegrinding apparatus,

In the lower part of the frame A is hung the horizontal longitudinaldriving-shaft B, which receives rotary motion by suitable mechanism.

Above the shaft B are hung, in adjustable bearings, (i. the grindstoneshafts OG, which carry, on their inner` ends, the circular grindstonesI), ot' suitable material. The grinding-faces of the stones D areopposite each other and near together, as shown.

The inner bearing a of each shaft C is pivoted or swivele'd to the frameA. The outer bearing, however, has a tenon fitting through a circularslot or groove, c, and is, by a rod, d, connected with acrauk,

j; on a rook-shaft, E, which has a projecting handle,

e, whereby it can be turned. By means of the handle e the bearing b canbe set so as to put the shafts C into any desired oblique position,setting, thereby, .the grinding-faces of the stones D also obliqnely, asshown in iig. 2. The edges,which are thus 'brought near together, willthereby 'regulate the thickness to which the blade is to be ground. Thestones can, in this manner, be set oblique, to be .close together ateither side of the machine.

Belts, g y, or other mechanism,"scrvc to impart rotary lnotion to theshafts C. The lmachine has a guide on each side, for holding a saw, oneside being adapted to the grinding of hand-2 saws, while the other sideis for circular saws.

The hand-saw F is pivoted to a slide, G, which moves in a grooved guide,h, and is, by means -of' al rod, i, connected with the crank of arock-shaft, H; rlhe rock-shaft H receives oscillating motion from thedriving-shaft B, either by the connectonsj kl, shown in iig.,1, or byother suitablelrneans.

lIhe lower edge ot' the hand-saw rests on a shoe,.-I.Q- which'can beadjusted up and down by meauslotf` screws, m, to regulate theinclination of thegb de.

.The blade, by hanging in an inclined position'gfis ground more at thetop than at the lo'w er edge, and receives, thereby, thc'desircd taperin thickness.

\Vhile the stones revolve inthe same direction, the saw is moved backand forth between them by means ot' the slideG, which receivesreciprocating from the rock-shaft H.

rIhe circular' saw is secured in a slotted crank, n, of' a rock-shaft,J, which receives oscillating motion from 5 the shaft B by means of theconnections le I, or other mechanism.

When the circular saw is to be ground the grindingstones are drawntogether at the side on which said saw is held.

" Itis evident that the machine can also be used for grinding other flatimplements besides saws.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- 1. Thearrangement of the stones D Drsubstantially as shown and described, sothat the. saw-blades may be ground between their dat surfaces, asspecified.

2. The grindstones D, hung on shafts C, which hang in swiveled andadjustable bearings` lo b, substantially as-herein shown and described,so that the grinding-surfaces canbc adjusted at any desiredangle, asspecified. f

3. The combination of the outer bearings b with vthe rock-shaft E, bymeans of which the shafts O are adjusted, as specified. I

4. The slide Ur, arranged for holding the hand-saws, and connectedwiththe rock-shaft H, substantially as herein shown and described, tooperate as set forth.

5. The vertically-adjustable shoe I, combined with? the reciprocatingsaw-blade and with'the oblique grinders, substantially as herein shownand described.

CHARLESJ. GARDNER. Witnesses:

A. V. Bumsen, T. B. Mosrmn.

motion

